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Description:

Colloidal carbon dots (CDs) have garnered much attention as metal-free photoluminescent nanomaterials, yet creation of solid-state fluorescent (SSF) materials emitting in the deep red (DR) to near-infrared (NIR) range poses a significant challenge with practical implications. To address this challenge and to engineer photonic functionalities, a micro-resonator architecture is developed using carbonized polymer microspheres (CPMs), evolved from conventional colloidal nanodots. Gram-scale production of CPMs utilizes controlled microscopic phase separation facilitated by natural peptide cross-linking during hydrothermal processing. The resulting microstructure effectively suppresses aggregation-induced quenching (AIQ), enabling strong solid-state light emission. Both experimental and theoretical analysis support a role for extended π conjugated polycyclic aromatic hydrocarbons (PAHs) trapped within these microstructures, which exhibit a progressive red shift in light absorption/emission toward the NIR range. Moreover, the highly spherical shape of CPMs endows them with innate photonic functionalities in combination with their intrinsic CD-based attributes. Harnessing their excitation wavelength-dependent photoluminescent (PL) property, a single CPM exhibits whispering-gallery modes (WGMs) that are emission-tunable from the DR to the NIR. This type of newly developed microresonator can serve as, for example, unclonable anti-counterfeiting labels. This innovative cross-cutting approach, combining photonics and chemistry, offers robust, bottom-up, built-in photonic functionality with diverse NIR applications.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Carbonized polymer microsphere, Rare earth free, fluorescence, multicolor emission, near-infrared, encoded-anti-counterfeit, ecofriendly

Date published: 2024-06-12

Publisher: Wiley-Blackwell

Journal:

• Advanced Science (ISSN: 21983844) vol. 11 issue. 30 2400693

Funding:

• JSPS 24K17589 (Chromaticity-adaptive direct white light generation from luminescent carbogenic nanomaterials coupled with nanophotonic cavity)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4952

First published URL: https://doi.org/10.1002/advs.202400693

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Updated at: 2024-11-13 16:30:31 +0900

Published on MDR: 2024-11-13 16:30:31 +0900